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Bug#1104080: linux: Please build with CONFIG_KERNEL_GZIP=y instead of CONFIG_KERNEL_XZ=y on sh4

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On Fri, 2025-05-02 at 18:54 +0200, Ben Hutchings wrote:
> Control: tag -1 moreinfo
> 
> On Fri, 25 Apr 2025 11:38:14 +0200 John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> wrote:
> > Source: linux
> > Version: 6.12.22-1
> > Severity: normal
> > User: debian-superh@lists.debian.org
> > Usertags: sh4
> > X-Debbugs-Cc: debian-superh@lists.debian.org
> > 
> > Hello,
> > 
> > src:linux currently fails to build from source on sh4 due to the kernel
> > image compression set to XZ (CONFIG_KERNEL_XZ=y).
> 
> You didn't say exactly why xz is a problem, but looking at the logs I
> see xz sometimes failing with an out-of-memory error.
[...]

By the way, this seems to be due to:

commit 8653c909922743bceb4800e5cc26087208c9e0e6
Author: Lasse Collin <lasse.collin@tukaani.org>
Date:   Sun Jul 21 16:36:28 2024 +0300
 
    xz: use 128 MiB dictionary and force single-threaded mode

which causes xz to allocate 1346 MiB (!) at build time.

If you have the time, it might be worth trying to add an option to use a
smaller dictionary size again.

Ben.

-- 
Ben Hutchings
Absolutum obsoletum. (If it works, it's out of date.) - Stafford Beer

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Bug#1104080: linux: Please build with CONFIG_KERNEL_GZIP=y instead of CONFIG_KERNEL_XZ=y on sh4 John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> - 2025-04-25 11:40 +0200
  Processed: Re: linux: Please build with CONFIG_KERNEL_GZIP=y  instead of CONFIG_KERNEL_XZ=y on sh4 "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-05-02 19:00 +0200
  Bug#1104080: linux: Please build with CONFIG_KERNEL_GZIP=y instead of CONFIG_KERNEL_XZ=y on sh4 Ben Hutchings <ben@decadent.org.uk> - 2025-05-02 19:00 +0200
    Bug#1104080: linux: Please build with CONFIG_KERNEL_GZIP=y instead of CONFIG_KERNEL_XZ=y on sh4 John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> - 2025-05-02 20:10 +0200
      Bug#1104080: linux: Please build with CONFIG_KERNEL_GZIP=y instead of CONFIG_KERNEL_XZ=y on sh4 Ben Hutchings <ben@decadent.org.uk> - 2025-05-02 20:20 +0200
        Bug#1104080: linux: Please build with CONFIG_KERNEL_GZIP=y instead of CONFIG_KERNEL_XZ=y on sh4 John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> - 2025-05-02 20:20 +0200
    Bug#1104080: linux: Please build with CONFIG_KERNEL_GZIP=y instead of CONFIG_KERNEL_XZ=y on sh4 Ben Hutchings <ben@decadent.org.uk> - 2025-05-02 21:00 +0200
  Processed: Re: linux: Please build with CONFIG_KERNEL_GZIP=y  instead of CONFIG_KERNEL_XZ=y on sh4 "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-05-02 20:20 +0200
  Bug#1104080: linux: Please build with CONFIG_KERNEL_GZIP=y instead of CONFIG_KERNEL_XZ=y on sh4 Ben Hutchings <ben@decadent.org.uk> - 2025-05-02 20:20 +0200
    Bug#1104080: linux: Please build with CONFIG_KERNEL_GZIP=y instead of CONFIG_KERNEL_XZ=y on sh4 John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> - 2025-05-02 20:20 +0200
      Bug#1104080: linux: Please build with CONFIG_KERNEL_GZIP=y instead of CONFIG_KERNEL_XZ=y on sh4 Ben Hutchings <ben@decadent.org.uk> - 2025-05-02 20:30 +0200
  Bug#1104080: marked as done (linux: Please build with  CONFIG_KERNEL_GZIP=y instead of CONFIG_KERNEL_XZ=y on sh4) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-05-09 22:50 +0200

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